Have a look at this article https://communities.sas.com/t5/SAS-Communities-Library/Introduction-to-Integration-of-SAS-Visual-Analytics-with-SAS/ta-p/670823 by @Renato_sas it shows how you can call a job and pass data to the job.
To have the value of a parameter available, you need to use the parameter in the filter pane of the DDC object, see example below, where typeSelection is your parameter
IF ( 'typeSelection'p IsSet )
RETURN ( 1 = 1 )
ELSE ( 1 = 1 )
This will ensure, that the values of the parameter are available to the job called in the DDC. See the Json passed to the DDC.
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